Umbris, Fear Manifest, Opposition Agent, Hive Mind, Mana Severance, and Deadeye Navigator

Prerequisites

• Umbris, Fear Manifest on the battlefield
• Opposition Agent on the battlefield
• Hive Mind on the battlefield
• Mana Severance in hand
• Deadeye Navigator on the battlefield
• Deadeye Navigator is paired with Umbris
• plus an additional for each opponent you have available

Steps

1. Cast Mana Severance by paying
2. Hive Mind triggers, causing each opponent to copy Mana Severance
3. Resolve each opponent's Mana Severance, searching for and exiling all land cards from their libraries
4. Resolve your Mana Severance, choosing not to exile any land cards from your library
5. Activate Umbris by paying , blinking Umbris
6. Umbris triggers, revealing no lands from an opponent library, exiling their library
7. Repeat from step 5 for each opponent

Results

• Exile each opponent's library
• Near-infinitely large Umbris